[PATCH net v5 0/2] virtio-net: fix for VIRTIO_NET_F_GUEST_HDRLEN

[Xuan Zhuo]

The commit be50da3e9d4a ("net: virtio_net: implement exact header length
guest feature") introduces support for the VIRTIO_NET_F_GUEST_HDRLEN
feature in virtio-net.

This feature requires virtio-net to set hdr_len to the actual header
length of the packet when transmitting, the number of
bytes from the start of the packet to the beginning of the
transport-layer payload.

However, in practice, hdr_len was being set using skb_headlen(skb),
which is clearly incorrect. This path set fixes that issue.

As discussed in [0], this version checks the VIRTIO_NET_F_GUEST_HDRLEN is
negotiated.

[0]: http://lore.kernel.org/all/20251029030913.20423-1-xuanzhuo@linux.alibaba.com

Xuan Zhuo (2):
  virtio-net: correct hdr_len handling for VIRTIO_NET_F_GUEST_HDRLEN
  virtio-net: correct hdr_len handling for tunnel gso

 arch/um/drivers/vector_transports.c |  1 +
 drivers/net/tun_vnet.h              |  4 +--
 drivers/net/virtio_net.c            |  9 +++++--
 include/linux/virtio_net.h          | 40 +++++++++++++++++++++++------
 net/packet/af_packet.c              |  5 ++--
 5 files changed, 45 insertions(+), 14 deletions(-)

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2.32.0.3.g01195cf9f